Endocrine complications in pancreatitis US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Endocrine complications in pancreatitis. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Endocrine complications in pancreatitis US Medical PG Question 1: A 22-year-old woman with type 1 diabetes mellitus and mild asthma comes to the physician for a follow-up examination. She has had several episodes of sweating, dizziness, and nausea in the past 2 months that occur during the day and always resolve after she drinks orange juice. She is compliant with her diet and insulin regimen. The physician recommends lowering her insulin dose in certain situations. This recommendation is most important in which of the following situations?
- A. After a stressful exam
- B. During a viral infection
- C. Before exercise (Correct Answer)
- D. After large meals
- E. During pregnancy
Endocrine complications in pancreatitis Explanation: ***Before exercise***
- Exercise increases **glucose utilization** by muscles, which can lead to **hypoglycemia** in individuals taking insulin if the dose isn't adjusted.
- The patient's symptoms (sweating, dizziness, nausea) are classic for **hypoglycemia**, which resolves with sugar intake (orange juice).
*After a stressful exam*
- **Stress** typically elevates **counter-regulatory hormones** (e.g., cortisol, epinephrine), which can increase blood glucose levels rather than cause hypoglycemia.
- An insulin dose reduction is usually not necessary and could lead to **hyperglycemia** in this situation.
*During a viral infection*
- Infections, even viral ones, often trigger the release of **stress hormones**, increasing glucose production and leading to **hyperglycemia** and increased insulin requirements.
- Insulin doses usually need to be *increased*, not decreased, during illness to manage elevated blood sugar.
*After large meals*
- Large meals, especially those rich in carbohydrates, would necessitate an **increased or consistent insulin dose** to cover the glucose intake and prevent **postprandial hyperglycemia**.
- Reducing insulin after a large meal would likely lead to uncontrolled high blood sugar rather than prevent hypoglycemia.
*During pregnancy*
- While insulin requirements can fluctuate throughout pregnancy, they generally **increase** in the second and third trimesters due to increased **insulin resistance**.
- Reducing insulin during pregnancy without careful monitoring could lead to uncontrolled **hyperglycemia**, posing risks to both mother and fetus.
Endocrine complications in pancreatitis US Medical PG Question 2: A 10-year-old boy is brought to the emergency department by his mother due to frequent vomiting, abdominal pain, and weakness. Over the last 5 days, has been noted to have polydipsia and polyuria. Family history is irrelevant. His temperature is 37.1°C (98.7°F), blood pressure is 100/70 mm Hg, and pulse is 110/min. Physical examination reveals no response to verbal commands, sunken eyes, poor skin turgor, and rapid deep respirations. Laboratory results are shown:
Random plasma glucose 420 mg/dL
Serum beta-hydroxybutyrate elevated
Fasting C-peptide undetectable
Antiglutamic acid decarboxylase (GAD) antibodies positive
This patient's condition occurs as a result of which of the following?
- A. Insulin resistance
- B. Starvation
- C. Immune-mediated destruction of pancreatic beta cells (Correct Answer)
- D. Defective synthesis or release of arginine vasopressin
- E. Salicylate poisoning
Endocrine complications in pancreatitis Explanation: ***Immune-mediated destruction of pancreatic beta cells***
- The diagnosis of **Type 1 Diabetes Mellitus (T1DM)** is strongly supported by the patient's age (10 years old), rapid onset of symptoms (frequent vomiting, abdominal pain, weakness, polydipsia, polyuria), **random plasma glucose of 420 mg/dL**, elevated **serum beta-hydroxybutyrate** (indicating **diabetic ketoacidosis**), and specifically, the **positive antiglutamic acid decarboxylase (GAD) antibodies** and **undetectable fasting C-peptide**.
- **Antiglutamic acid decarboxylase (GAD) antibodies** are a common marker for autoimmune destruction of **pancreatic beta cells**, which leads to **absolute insulin deficiency**. **C-peptide** is a byproduct of insulin synthesis; its absence indicates the pancreas is not producing insulin.
*Insulin resistance*
- **Insulin resistance** is characteristic of **Type 2 Diabetes Mellitus (T2DM)**, which typically presents in older individuals, often with **obesity**, and is not associated with **positive GAD antibodies** or **undetectable C-peptide**.
- In **insulin resistance**, the body produces insulin, often in high amounts initially, but the cells do not respond effectively, leading to hyperglycemia.
*Starvation*
- While **starvation** can lead to **ketogenesis** and signs like weakness, it would typically result in **hypoglycemia** or normal glucose levels, not profound hyperglycemia (420 mg/dL).
- The presence of **polydipsia**, **polyuria**, and positive **GAD antibodies** rules out starvation as the primary cause.
*Defective synthesis or release of arginine vasopressin*
- This describes **diabetes insipidus**, a condition characterized by **polyuria** and **polydipsia** due to impaired water reabsorption by the kidneys.
- However, **diabetes insipidus** is not associated with **hyperglycemia**, **ketosis**, or **positive GAD antibodies** and therefore does not fit the overall clinical picture.
*Salicylate poisoning*
- **Salicylate poisoning** can cause metabolic acidosis (often with a respiratory alkalosis component), vomiting, and altered mental status.
- However, it does not explain the profound **hyperglycemia** and is not associated with **positive GAD antibodies** or undetectable **C-peptide**.
Endocrine complications in pancreatitis US Medical PG Question 3: A 13-year-old girl presents after losing consciousness during class 30 minutes ago. According to her friends, she was doing okay since morning, and nobody noticed anything abnormal. The patient’s mother says that her daughter does not have any medical conditions. She also says that the patient has always been healthy but has recently lost weight even though she was eating as usual. Her vital signs are a blood pressure of 100/78 mm Hg, a pulse of 89/min, and a temperature of 37.2°C (99.0°F). Her breathing is rapid but shallow. Fingerstick glucose is 300 mg/dL. Blood is drawn for additional lab tests, and she is started on intravenous insulin and normal saline. Which of the following HLA subtypes is associated with this patient’s most likely diagnosis?
- A. DR3 (Correct Answer)
- B. A3
- C. B8
- D. DR5
- E. B27
Endocrine complications in pancreatitis Explanation: ***DR3***
- The patient's presentation with **recent weight loss despite normal eating**, rapid but shallow breathing (**Kussmaul respiration** hinting at **metabolic acidosis**), elevated blood glucose (300 mg/dL), and loss of consciousness strongly suggests **Type 1 Diabetes Mellitus (T1DM)** presenting as **diabetic ketoacidosis (DKA)**.
- **HLA-DR3** and **HLA-DR4** are the primary genetic markers most strongly associated with an increased susceptibility to Type 1 Diabetes Mellitus, an **autoimmune disease** affecting pancreatic beta cells.
- **HLA-DR3** is the most direct answer as it is one of the two strongest HLA-DR associations with T1DM.
*A3*
- **HLA-A3** is primarily associated with **hemochromatosis**, a disorder of iron metabolism, and is not a common genetic marker for Type 1 Diabetes Mellitus.
- The symptoms described in the patient (weight loss, hyperglycemia, DKA) are not characteristic of hemochromatosis.
*B8*
- **HLA-B8** is actually associated with Type 1 Diabetes Mellitus as part of the **extended haplotype A1-B8-DR3**, which shows strong linkage disequilibrium.
- However, **HLA-B8 is not as directly or specifically associated with T1DM** as the HLA-DR subtypes (DR3 and DR4), which are considered the primary genetic markers.
- When asking about HLA subtypes associated with T1DM, **DR3 or DR4** are the best answers as they show the strongest and most direct association.
- HLA-B8 is also associated with other autoimmune conditions like **myasthenia gravis** and **Graves' disease**.
*DR5*
- While part of the **HLA-DR family**, **HLA-DR5** is less commonly associated with **Type 1 Diabetes Mellitus** compared to DR3 and DR4.
- This subtype is more frequently linked with conditions like **pernicious anemia** or increased risk of certain infections.
*B27*
- **HLA-B27** is strongly associated with **seronegative spondyloarthropathies**, such as **ankylosing spondylitis** and **reactive arthritis**.
- It has no known direct association with **Type 1 Diabetes Mellitus**.
Endocrine complications in pancreatitis US Medical PG Question 4: A 55-year-old woman who is an established patient presents to your office. She is complaining of increased urination and increased thirst. She has recently began taking several over-the-counter vitamins and supplements. On further review, she reports she has also been having abdominal pain and constipation. She denies significant weight changes. Her fingerstick blood glucose in your office is 96 mg/dL.
Which of the following test is most likely to provide the diagnosis?
- A. Niacin levels
- B. Pyridoxine levels
- C. Hemoglobin A1C
- D. Free T4 levels
- E. Calcium level (Correct Answer)
Endocrine complications in pancreatitis Explanation: ***Calcium level***
- The constellation of **polyuria**, **polydipsia**, **abdominal pain**, and **constipation** is classic for **hypercalcemia** (remembered by "stones, bones, groans, and psychiatric overtones").
- **Hypercalcemia** causes **nephrogenic diabetes insipidus** (leading to polyuria and polydipsia) and **GI dysmotility** (causing constipation and abdominal pain).
- The key clinical clue is **recent supplement use** - excessive intake of **calcium-containing supplements** or **vitamin D** (which increases calcium absorption) can cause **hypercalcemia**.
- Other causes include **primary hyperparathyroidism** and **malignancy**, but the supplement history makes iatrogenic hypercalcemia most likely.
*Niacin levels*
- **Niacin** (Vitamin B3) deficiency causes **pellagra** (dermatitis, diarrhea, dementia), while toxicity causes flushing and hepatotoxicity.
- These symptoms are not present in this patient, making niacin levels an unlikely diagnostic test.
*Pyridoxine levels*
- **Pyridoxine** (Vitamin B6) deficiency causes peripheral neuropathy and sideroblastic anemia; toxicity causes sensory neuropathy.
- Neither deficiency nor toxicity explains polyuria, polydipsia, abdominal pain, and constipation.
*Hemoglobin A1C*
- While polyuria and polydipsia suggest **diabetes mellitus**, the **normal fingerstick blood glucose of 96 mg/dL** makes diabetes unlikely.
- An A1C assesses long-term glycemic control but would not explain the abdominal pain, constipation, or supplement connection.
*Free T4 levels*
- **Hypothyroidism** causes constipation, but not typically polyuria or polydipsia.
- **Hyperthyroidism** can cause increased thirst but does not explain the full symptom complex, particularly the abdominal pain and supplement history.
- Thyroid dysfunction is less likely than hypercalcemia given the clinical presentation.
Endocrine complications in pancreatitis US Medical PG Question 5: A 28-year-old man is brought in by ambulance to the ER, barely conscious, after feeling drowsy and falling to the floor during a presentation several hours ago. His colleague who accompanied him says he has had similar episodes 5 times in the past 3 months. No significant past medical history. His blood pressure is 110/80 mm Hg and pulse is 114/min. His capillary blood glucose is 15 mg/dL. Immediate IV dextrose with thiamine is started, and he rapidly regains consciousness. A contrast CT of the abdomen is performed which reveals a tumor in the pancreas. Which of the following relative laboratory findings would you most likely expect to find in this patient?
- A. Glucose: ↑, Insulin: ↓, C-Peptide: ↓, Ketoacidosis: Present
- B. Glucose: Normal, Insulin: Normal, C-Peptide: Normal, Ketoacidosis: Absent
- C. Glucose: ↓, Insulin: ↑, C-Peptide: ↑, Ketoacidosis: Absent (Correct Answer)
- D. Glucose: ↓, Insulin: ↑, C-Peptide: ↓, Ketoacidosis: Absent
- E. Glucose: ↑, Insulin: ↑/Normal, C-Peptide: ↑/Normal, Ketoacidosis: Absent
Endocrine complications in pancreatitis Explanation: ***Glucose: ↓, Insulin: ↑, C-Peptide: ↑, Ketoacidosis: Absent***
- The patient's **hypoglycemia (15 mg/dL)**, coupled with a pancreatic tumor and recurrent episodes, strongly suggests an **insulinoma**.
- An **insulinoma** is an insulin-secreting tumor, leading to **high insulin** and **C-peptide** levels in the presence of low glucose, and typically no ketoacidosis because insulin inhibits ketogenesis.
*Glucose: ↑, Insulin: ↓, C-Peptide: ↓, Ketoacidosis: Present*
- This profile describes **Type 1 Diabetes Mellitus** or severe insulin deficiency, where high glucose is due to lack of insulin production and subsequent diabetic ketoacidosis.
- The patient's symptoms (hypoglycemia) and the presence of a pancreatic tumor producing insulin are contradictory to this profile.
*Glucose: Normal, Insulin: Normal, C-Peptide: Normal, Ketoacidosis: Absent*
- This profile represents a **healthy individual** with normal metabolic function, which is inconsistent with the patient's severe hypoglycemia and recurrent collapses.
- It would not explain the patient's symptoms or the pancreatic tumor's function.
*Glucose: ↓, Insulin: ↑, C-Peptide: ↓, Ketoacidosis: Absent*
- This finding would be typical of **exogenous insulin administration** (e.g., insulin overdose) where insulin levels are high, but C-peptide (which is co-secreted with endogenous insulin) is low.
- While hypoglycemia is present, the low C-peptide contradicts the presence of an endogenous insulin-secreting pancreatic tumor.
*Glucose: ↑, Insulin: ↑/Normal, C-Peptide: ↑/Normal, Ketoacidosis: Absent*
- These findings could be seen in conditions like **Type 2 Diabetes** with **insulin resistance** or Cushing's syndrome where glucose and insulin might be elevated, but the patient's primary presentation is severe hypoglycemia.
- This profile does not align with the patient's profound hypoglycemia and clinical picture of an insulinoma.
Endocrine complications in pancreatitis US Medical PG Question 6: A 28-year-old man presents to the emergency department with diffuse abdominal pain and nausea for the past 5 hours. The pain started with a dull ache but is now quite severe. He notes that he “just doesn’t feel like eating” and has not eaten anything for almost a day. Although the nausea is getting worse, the patient has not vomited. He notes no medical issues in the past and is not currently taking any medications. He admits to drinking alcohol (at least 2–3 bottles of beer per day after work and frequent binge-drinking weekends with friends). He says that he does not smoke or use illicit drugs. Vital signs include: pulse rate 120/min, respiratory rate 26/min, and blood pressure 100/70 mm Hg. On examination, the patient’s abdomen is diffusely tender. His breath smells like alcohol, with a fruity tinge to it. Bowel sounds are present. No other findings are noted. Fingerstick glucose is 76mg/dL. After the examination, the patient suddenly and spontaneously vomits. Which of the following is the underlying mechanism of the most likely diagnosis in this patient?
- A. Increased acetyl CoA levels (Correct Answer)
- B. Inadequate insulin production
- C. Increased osmolal gap
- D. Starvation
- E. Thiamine deficiency
Endocrine complications in pancreatitis Explanation: ***Increased acetyl CoA levels***
- This patient presents with **alcoholic ketoacidosis (AKA)**, and the underlying biochemical mechanism is the accumulation of **acetyl CoA** that is shunted into ketone body synthesis.
- In AKA, starvation depletes glycogen stores and **oxaloacetate** (needed for the TCA cycle). Simultaneously, alcohol metabolism increases the **NADH/NAD+ ratio**, which further impairs gluconeogenesis and reduces oxaloacetate availability.
- Enhanced lipolysis (due to low insulin and high counter-regulatory hormones) produces large amounts of fatty acids, which undergo β-oxidation to generate **acetyl CoA**.
- With insufficient oxaloacetate to enter the TCA cycle, acetyl CoA accumulates and is diverted to **ketogenesis** (producing acetoacetate, β-hydroxybutyrate, and acetone).
- The **fruity breath** is from acetone, and the metabolic acidosis causes the patient's symptoms (abdominal pain, nausea, tachycardia, tachypnea).
*Starvation*
- While **starvation** is a critical **precipitating factor** in AKA (it depletes glycogen and triggers lipolysis), it is not the underlying biochemical mechanism itself.
- Starvation creates the metabolic conditions (low insulin, depleted oxaloacetate) that lead to the accumulation of acetyl CoA and subsequent ketogenesis, but the question asks for the mechanism, not the trigger.
*Inadequate insulin production*
- **Inadequate insulin production** is the primary defect in **diabetic ketoacidosis (DKA)**, which is ruled out by this patient's normal blood glucose (76 mg/dL).
- In AKA, insulin levels are typically low (due to starvation), but this is secondary to metabolic stress rather than a primary pancreatic failure. The key mechanism is still the acetyl CoA accumulation and shunting to ketogenesis.
*Increased osmolal gap*
- An **increased osmolal gap** suggests unmeasured osmolytes, typically seen with toxic alcohol ingestions (methanol, ethylene glycol) or severe lactic acidosis.
- While ethanol itself can transiently increase the osmolal gap, this is not the mechanism explaining the ketoacidosis, fruity breath, and clinical presentation in this case.
*Thiamine deficiency*
- **Thiamine deficiency** is common in chronic alcoholics and causes Wernicke-Korsakoff syndrome and other neurological complications.
- Thiamine is a cofactor for pyruvate dehydrogenase and α-ketoglutarate dehydrogenase, but its deficiency does not directly cause the ketoacidosis seen here, which results from altered lipid metabolism and acetyl CoA accumulation.
Endocrine complications in pancreatitis US Medical PG Question 7: A newborn whose mother had uncontrolled diabetes mellitus during pregnancy is likely to have which of the following findings?
- A. Amyloid deposits in pancreatic islets
- B. Atrophy of pancreatic islets cells
- C. Hyperglycemia
- D. Ketoacidosis
- E. Hypoglycemia (Correct Answer)
Endocrine complications in pancreatitis Explanation: ***Hypoglycemia***
- Uncontrolled maternal diabetes leads to **fetal hyperglycemia**, causing the fetal pancreas to produce **excessive insulin** (fetal hyperinsulinism) to compensate.
- After birth, the maternal glucose supply is cut off, but the newborn's pancreas continues to overproduce insulin, leading to **rapid drops in blood glucose** and severe hypoglycemia.
*Amyloid deposits in pancreatic islets*
- **Amyloid deposits** in pancreatic islets are characteristic of **Type 2 Diabetes Mellitus** in adults, typically not seen in newborns or as a direct consequence of maternal diabetes.
- This condition involves the accumulation of **islet amyloid polypeptide (IAPP)**, which is different from the physiological responses seen in infants of diabetic mothers.
*Atrophy of pancreatic islets cells*
- **Atrophy of pancreatic islet cells** is seen in late-stage **Type 1 Diabetes Mellitus** due to autoimmune destruction, not in infants of diabetic mothers, who typically have hypertrophied islets.
- In newborns of diabetic mothers, the pancreatic beta cells are usually **hypertrophic and hyperplastic** due to chronic glucose stimulation.
*Hyperglycemia*
- While the fetus experiences **hyperglycemia** in utero due to maternal diabetes, the newborn after birth typically develops **hypoglycemia** once the continuous maternal glucose supply is removed.
- The newborn's elevated insulin levels, in response to chronic fetal hyperglycemia, quickly deplete available glucose post-delivery, leading to low blood sugar.
*Ketoacidosis*
- **Ketoacidosis** occurs when the body produces high levels of **ketones** due to severe insulin deficiency and high glucose, which is primarily seen in **Type 1 Diabetes Mellitus** or severe stress states.
- Newborns of diabetic mothers are more prone to hypoglycemia due to **hyperinsulinism**, which inhibits ketogenesis, rather than ketoacidosis.
Endocrine complications in pancreatitis US Medical PG Question 8: A 47-year-old woman presents to her primary care physician because of pain on urination, urinary urgency, and urinary frequency for 4 days. This is the third time for her to have these symptoms over the past 7 months. She was recently treated for candidal intertrigo. Vital signs reveal a temperature of 36.7°C (98.0°F), blood pressure of 110/70 mm Hg and pulse of 75/min. Physical examination is unremarkable except for morbid obesity. Her father has type 2 diabetes complicated by end-stage chronic kidney disease. A1C is found to be 8.5%. The patient is given a prescription for her urinary symptoms. Which of the following is the best next step for this patient?
- A. Sulphonylurea added to metformin
- B. Bariatric surgery
- C. Repeating the A1c test
- D. Basal-bolus insulin
- E. Metformin (Correct Answer)
Endocrine complications in pancreatitis Explanation: ***Metformin***
- The patient has symptoms suggestive of **uncontrolled type 2 diabetes**, including recurrent infections (urinary, intertrigo) and a familial history, despite an A1C of 8.5%.
- **Metformin** is typically the first-line pharmacologic treatment for type 2 diabetes unless contraindicated, as it improves insulin sensitivity and reduces hepatic glucose production.
*Sulphonylurea added to metformin*
- While adding a sulfonylurea to metformin is an option for patients not reaching glycemic targets on metformin alone, **monotherapy with metformin** is the initial step for newly diagnosed or uncontrolled diabetes.
- Sulfonylureas carry a higher risk of **hypoglycemia** compared to metformin and are generally added if metformin monotherapy is insufficient.
*Bariatric surgery*
- Bariatric surgery is a treatment option for **morbidly obese** individuals with type 2 diabetes, but it is typically considered after lifestyle modifications and pharmacotherapy have been attempted or when the BMI is very high (e.g., >40 or >35 with comorbidities).
- It is not the immediate next step for managing newly diagnosed or uncontrolled diabetes, especially when first-line medications haven't been initiated.
*Repeating the A1c test*
- The elevated **A1C of 8.5%**, combined with classic symptoms of hyperglycemia (recurrent infections, polyuria from urinary symptoms), is sufficient for a diagnosis of diabetes.
- Repeating the test immediately is unlikely to change the diagnosis and would delay necessary treatment initiation.
*Basal-bolus insulin*
- Basal-bolus insulin regimens are typically reserved for patients with very **high A1C levels** (e.g., >10%), significant symptoms of hyperglycemia, or those who have failed multiple oral hypoglycemic agents.
- Given an A1C of 8.5%, initiating insulin is usually not the first pharmacologic step; metformin monotherapy is preferred.
Endocrine complications in pancreatitis US Medical PG Question 9: A 59-year-old man presents to the emergency department with diffuse abdominal pain, nausea, and vomiting. Laboratory evaluation on admission is significant for serum glucose of 241 mg/dL, AST of 321 IU/L, and leukocytes of 21,200/μL. Within 3 days of admission with supportive care in the intensive care unit, the patient's clinical condition begins to improve. Based on Ranson's criteria, what is this patient's overall risk of mortality, assuming all other relevant factors are negative?
- A. 15% (Correct Answer)
- B. 40%
- C. 100%
- D. 80%
- E. < 10%
Endocrine complications in pancreatitis Explanation: ***15%***
- This patient meets four Ranson's criteria on admission: **age > 55 years** (59 years), **WBC > 16,000/μL** (21,200/μL), **glucose > 200 mg/dL** (241 mg/dL), and **AST > 250 U/L** (321 U/L).
- Four Ranson's criteria correspond to a **15% mortality risk**.
- The stem specifies that all other relevant factors (the 48-hour criteria) are negative.
*40%*
- A 40% mortality risk is associated with **5-6 positive Ranson's criteria**.
- This patient fulfilled 4 criteria on admission, indicating a lower risk category.
*100%*
- A 100% mortality risk is associated with **7 or more positive Ranson's criteria**.
- This patient only fulfilled 4 criteria, indicating a significantly lower risk.
*80%*
- An 80% mortality risk is associated with **7 or more positive Ranson's criteria**.
- This patient only fulfilled 4 criteria, which places him in a much lower risk category.
*< 10%*
- A mortality risk of less than 10% typically correlates with **0-2 positive Ranson's criteria**.
- This patient has 4 positive criteria, placing him in a higher risk category.
Endocrine complications in pancreatitis US Medical PG Question 10: A 44-year-old female is brought to the emergency room after losing consciousness at a shopping mall. Her husband states that they were shopping when the patient appeared sweaty and tremulous, became confused, then collapsed. She was unconscious for 5 minutes until a paramedic arrived. Fingerstick glucose at that time was 31 mg/dL and intramuscular glucagon was administered. The patient regained consciousness as she was being transported to the ambulance. On arrival in the emergency room, she is conscious but sleepy. She is able to report that her last meal prior to the mall was 5 hours ago. Her husband notes that over the last 3 months, she has complained of headaches and a milky discharge from both breasts, as well as nausea if she goes too long without eating. She works as an inpatient nurse and was exposed to tuberculosis 10 years ago but adequately treated. Because she was adopted as an infant, family history is unknown. Temperature is 98.4 deg F (36.9 deg C), blood pressure is 101/59 mmHg, pulse is 88/min, and respiration is 14/min. Preliminary lab values are shown below:
Plasma glucose: 54 mg/dL
Plasma insulin: 29 pmol/L (normal < 19 pmol/L)
Plasma C-peptide: 272 pmol/L (normal < 200 pmol/L)
Plasma proinsulin: 8 pmol/L (normal < 5 pmol/L)
Plasma ß-hydroxybutyrate: 1.2 mmol/L (normal > 2.7 mmol/L after fasting)
Which of the following is the most likely cause of this patient’s hypoglycemic episode?
- A. Noninsulinoma pancreatogenous hypoglycemia syndrome (NIPHS)
- B. Primary adrenal insufficiency
- C. Insulinoma (Correct Answer)
- D. Sulfonylurea use
- E. Exogenous insulin use
Endocrine complications in pancreatitis Explanation: ***Insulinoma***
- The patient's presentation with **recurrent hypoglycemic episodes** (sweaty, tremulous, confused, collapsed) that resolve with glucose administration (intramuscular glucagon) is highly suggestive of an insulinoma.
- The laboratory findings of **elevated insulin, C-peptide, and proinsulin levels** during hypoglycemia, coupled with suppressed beta-hydroxybutyrate, confirm endogenous hyperinsulinism, characteristic of an insulin-producing tumor. The **galactorrhea** and **headaches** suggest a possible co-occurring **pituitary adenoma** as part of **MEN1**, which is often associated with insulinomas.
*Noninsulinoma pancreatogenous hypoglycemia syndrome (NIPHS)*
- NIPHS typically presents with **postprandial hypoglycemia** and is more common after gastric bypass surgery, which is not mentioned in this patient's history.
- While it also involves endogenous hyperinsulinism, the patient's symptoms are more consistent with **fasting hypoglycemia**, a hallmark of insulinoma.
*Primary adrenal insufficiency*
- Adrenal insufficiency can cause hypoglycemia due to **cortisol deficiency**, which impairs gluconeogenesis.
- However, the lab results show **elevated insulin and C-peptide**, indicating hyperinsulinism, which is not characteristic of primary adrenal insufficiency.
*Sulfonylurea use*
- Sulfonylureas stimulate insulin release from pancreatic beta cells, leading to **elevated insulin and C-peptide** levels during hypoglycemia.
- However, the patient's history does not mention diabetes or sulfonylurea use, and her persistent symptoms over months without a diagnosis of diabetes make this less likely. A **sulfonylurea screen** would distinguish this.
*Exogenous insulin use*
- Exogenous insulin administration would result in **high insulin levels** but **suppressed C-peptide levels**, as C-peptide is co-secreted with endogenous insulin.
- The patient's lab results show **elevated C-peptide**, ruling out exogenous insulin as the sole cause of hyperinsulinism.
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